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    Wyświetlanie 1-3 z 3
    Tytuł:
    An efficient analysis of steady-state heat conduction involving curved line/surface heat sources in two/three-dimensional isotropic media
    Autorzy:
    Mohammadi, M.
    Hematiyan, M. R.
    Shiah, Y. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/279914.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    heat conduction
    concentrated heat source
    curved heat source
    mesh-free method
    Opis:
    In this paper, a new formulation based on the method of fundamental solutions for two/three- -dimensional steady-state heat conduction problems involving internal curved line/surface heat sources is presented. Arbitrary shapes and non-uniform intensities of the curved heat sources can be modeled by an assemblage of several parts with quadratic variations. The presented mesh-free modeling does not require any internal points as in domain methods. Four numerical examples are studied to verify the validity and efficiency of the proposed method. Our analyses have shown that the presented mesh-free formulation is very efficient in comparison with conventional boundary or domain solution techniques.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1123-1137
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Free vibration analysis of sandwich beam with porous FGM core in thermal environment using mesh-free approach
    Autorzy:
    Hung, Tran Quang
    Tu, Tran Minh
    Duc, Do Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/27309844.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    thermal vibration
    mesh-free method
    sandwich beam
    porous materials
    wibracje termiczne
    metoda bezsiatkowa
    belka kanapkowa
    materiały porowate
    Opis:
    Thermally induced free vibration of sandwich beams with porous functionally graded material core embedded between two isotropic face sheets is investigated in this paper. The core, in which the porosity phase is evenly or unevenly distributed,has mechanical properties varying continuously along with the thickness according to the power-law distribution. Effects of shear deformation on the vibration behavior are taken into account based on both third-order and quasi-3D beam theories. Three typical temperature distributions, which are uniform, linear, and nonlinear temperature rises, are supposed. A mesh-free approach based on point interpolation technique and polynomial basis is utilized to solve the governing equations of motion. Examples for specific cases are given, and their results are compared with predictions available in the literature to validate the approach. Comprehensive studies are carried out to examine the effects of the beam theories, porosity distributions, porosity volume fraction, temperature rises, temperature change, span-to-height ratio, different boundary conditions, layer thickness ratio, volume fraction index on the vibration characteristics of the beam.
    Źródło:
    Archive of Mechanical Engineering; 2022, LXIX, 3; 471--496
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of ship motions via a three-dimensional time-domain method following a quad-tree adaptive mesh technique
    Autorzy:
    Zhang, Teng
    Ren, Junsheng
    Liu, Lu
    Powiązania:
    https://bibliotekanauki.pl/articles/259860.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Froude-Krylov forces
    adaptive mesh technique
    analytical
    transient free surface Green function
    precise integration method
    Opis:
    A three-dimensional (3D) time-domain method is developed to predict ship motions in waves. To evaluate the Froude- Krylov (F-K) forces and hydrostatic forces under the instantaneous incident wave profile, an adaptive mesh technique based on a quad-tree subdivision is adopted to generate instantaneous wet meshes for ship. For quadrilateral panels under both mean free surface and instantaneous incident wave profiles, Froude-Krylov forces and hydrostatic forces are computed by analytical exact pressure integration expressions, allowing for considerably coarse meshes without loss of accuracy. And for quadrilateral panels interacting with the wave profile, F-K and hydrostatic forces are evaluated following a quad-tree subdivision. The transient free surface Green function (TFSGF) is essential to evaluate radiation and diffraction forces based on linear theory. To reduce the numerical error due to unclear partition, a precise integration method is applied to solve the TFSGF in the partition computation time domain. Computations are carried out for a Wigley hull form and S175 container ship, and the results show good agreement with both experimental results and published results.
    Źródło:
    Polish Maritime Research; 2020, 1; 29-38
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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